Integrated cylinder head fluid injection apparatus

A system, comprising:

• an engine comprising an internal metallic structure arranged on a combustion chamber side of an external polymer composite structure, wherein the external polymer composite structure is molded as a single-piece onto and at least partially surrounding the internal metallic structure, and wherein the internal metallic structure is a single-piece structure comprising a fluid injection arrangement integrally formed therein,
• wherein the fluid injection arrangement comprises a primary fluid passage and a plurality of valves arranged outside of the internal metallic structure,
• wherein a plurality of secondary fluid passages extends from the primary fluid passage outside of the internal metallic structure and fluidly couples to a plurality of internal fluid passages integrally formed in the internal metallic structure, and
• wherein each of the plurality of internal fluid passages integrally formed in the internal metallic structure includes a common passage that divides into multiple passages within the internal metallic structure to flow fluid to a plurality of injection ports.

An engine cylinder head, comprising:

• a lower portion comprising an internal metallic structure;
• and
• an upper portion comprising an external polymer composite structure at least partially surrounding the internal metallic structure,
• wherein the internal metallic structure is integrally formed with a fluid injection arrangement comprising a plurality of internal fluid passages fluidly coupled to a plurality of injection ports arranged adjacent to exhaust ports of a combustion chamber, wherein at least one of the plurality of injection ports protrudes into the combustion chamber,
• wherein the fluid injection arrangement comprises a primary fluid passage and a plurality of valves arranged outside of the internal metallic structure,
• wherein a plurality of secondary fluid passages extends from the primary fluid passage outside of the internal metallic structure and fluidly couples to a plurality of internal fluid passages integrally formed in the internal metallic structure, and
• wherein each of the plurality of internal fluid passages integrally formed in the internal metallic structure includes a common passage that divides into multiple passages within the internal metallic structure to flow fluid to a plurality of injection ports.